Yes, if the light was bright enough to be bothering someone - if the sun was shining directly at them for instance then it would be inconsiderate not to partially close the blind. This wasn't the case here. Each time that the cc closed the blinds it was still dark so there was no need.
I'm not claustrophobic but do like to see outside if I can which is why I try to make sure that I have a window seat.
If I was in an inside seat then it would be up to the person at the window to choose what they prefer.